Vibratory road roller

ABSTRACT

This provides a vibratory road roller having at least two driven roller drums lying one behind the other in the direction of travel. The drums are carried by a rigid frame. The drums which are placed one behind the other are of different weights. In one embodiment of the invention the roller drums are also of different lengths. At least one of the roller drums has a vibration shaft which carries eccentric weights.

United States Patent l 13,580,147

[72] inventor Benno'Kaltenegger [56] References Cited Kurhaustrasse73-79, 5202 Bend Sieg, UNITED STATES P ATENTS 2,587,343 2/1952 Lind94/5OX 1 PP 751,429 2,873,656 2/1959 Andersson 94/50 1 1968 2,878,7313/1959 Kressin 94/50 [451 P Z 1971 3,048,089 8/l962 Kaltenegger 94/50 1Pmmy Aug-25,1967 3,309,972 3/1967 Peters 94/50 [33] Germany [31 1 K63208Primary Examiner-Jacob L. Nackenoff Attorney-Lowry, Rmehart and MarkvaABSTRACT: This provides a vibratory road roller having at [54] g leasttwo driven roller drums lying one behind the other in the wmg directionof travel. The drums are carried by a rigid frame. [52] U.S. 94/50 Thedrums which are placed one behind the other are of dif- [51] Int. E0lc19/24 ferent weights. In one embodiment of the invention the roller [50]Ficldof Search 94/48, 49, drums are also of different lengths. At leastone of the roller drums has a vibration shaft which carries eccentricweights.

PATENTEU MAY 2 5197! SHEET '1 BF 3 INVENTOR BEA/No Macrame-6G ERPATENTEU mes m: 3580 1 47 SHEET 3 or 3 A m nm m 2 I FI6.5

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I i 5a /m 4 qr 26 36 INVENTOR BEN/v0 AM TE/VEGGER VIBRATORY ROAD ROLLERBACKGROUND OF THE INVENTION Vibratory road rollers wherein each rollerdrum is provided .driven by one motor. In addition, both of the rollerdrums are of the same weight. Therefore, the motor power for generatingvibrations is uniformly distributed to both drums. In this way, eachdrum can be supplied with a maximum of about 50 percent of the availablemotor power. Such a vibratory road roller of the prior art produces adouble number of strokes arising from the vibrations caused by theeccentric weights on each of the roller drums. However, only half themotor power is available for each stroke. That is, the predeterminedavailable motor performance sets a practical limit of about 50 percentto the effect of the strokes of each drum of the roller.

SUMMARY OF THE INVENTION An object of the invention is to provide avibratory road roller of the type mentioned hereinabove wherein themotor power available for vibratory work for a roller drum can be moreeconomically utilized;

Another object of this invention is to provide a vibratory 7 road rollerhaving driven roller drums lying one behind the other in a rigid framewherein one roller drum is considerably heavier than the other.

Another objectof the invention is to provide a vibratory road rollerhaving roller drums lying one behind the other in a shaft produce twiceas much force without the need for greater motor power than has beenutilized in the past.

A still further object of this invention is to provide a relativelyheavy stroke using 100 percent of the motor power instead of tworelatively weak strokes distributed between two drums which use about 50percent of the total motorpower. In this way, a considerably moreintensive vibratory effect of the road roller on the ground is achieved.The vibratory drum produces a strong vibratory stroke which is worthmore than two relatively weak strokes.

In one embodiment of this invention, a vibratory shaft is provided forboth roller drums. In this case, therefore, if it is necessary to use asmaller inertia force, only the vibratory shaft of the lighter rollerdrum need be driven. Less motor power may be taken up under theseconditions.

The heavier roller drum in the road roller of this invention may be fromabout 30 percent to about 50 percent heavier than the other roller drum.However, the heavier roller drum may be more than 50 percent heavierthan the other roller drum. In the latter instance, the heavier rollerdrum may weigh at least 50 percent of the overall weight of the roadroller.

In another embodiment of the invention, the eccentric weights of thevibratory shaft of the heavier drum are greater in weight than those ofthe lighter drum. The ratio of the eccentric weights on one shaft tothose on the other may correspond to about the ratio of the weights ofthe tires of the roller drums with respect to each other.

The invention contemplates the use of a clutch by which the motor can beselectively connected to drive the vibratory shaft of one or either ofthe drums. It is further contemplated that a reverse gear be provided toallow reverse travel for the road roller. The heavier drum isadvantageously the front drum of the road roller.

The roller drums may be of different lengths with the heavier drumhaving a greater length than the lighter drum. One embodiment of theinvention provides a structure wherein both drums ride with their sidefaces flush on the drive side of the road roller. The rigid frame isshaped on the other side to accommodate the different lengths of theroller drums and thereby provide a complete unit. With this structure,the road roller units can be coupled together so that a multiple-gangedroller unit can be provided. When'such a ganged roller unit is used, themiddle strip of road in the direction of road roller travel does notremain uncompressed.

BRIEF DESCRIPTION OF DRAWINGS other objects of this invention willappear in the following description and appended claims, reference beingmade to the accompanying, drawings forming a part of the specificationwherein like reference characters designate corresponding strokes on theground caused by the vibration of the eccentric parts in the severalviews.

In the accompanying drawings, wherein illustrative embodiments of theinvention are disclosed,

FIG. 1 shows a side view on the line H of FIG. 3 of a vibratory roadroller made in accordance with this invention,

FIG. 2 is a side view corresponding to FIG. 1 includingthe drive for thevibratory shaft,

FIG. 3 is a sectional viewon the line III-III of FIG. 1,

FIG. 4 is a side view of'anothervibratory road roller made in accordancewith this invention wherein the vibratory shafts of the roller drums maybe selectively driven,

FIG. 5 is a plan view of a further embodiment of a vibratory roller ofthis invention wherein all superstructural parts have been omitted, and

FIG. 6 is a side view of the embodiment of FIG. 5 wherein the rollerdrums are ganged.

DESCRIPTION OF SPECIFIC EMBODIMENT A vibratory road roller generallydesignated 1 has two roller drums 2 and 3lying one behind the other inthe direction of travel. The roller drums 2 and 3 are set in a rigidframe having an upper cover plate 6 which joins two sides '4 and 5. Theroller drum 2 has trunnions'8 mounted in bearings 7 at each side of theroller. The roller drum 3 is provided on each side with the axle parts 9mounted in bearings 10 on the sides 4 and 5. The road roller 1 isadvantageously self-propelling. The roller 1 is driven through a gearmeans which includes gear wheels ll, 12, 13 and 14.

The roller drums 2 and 3 have different weights. The drum 2 has arelatively light tire 2a, and the drum 3. has a relatively heavy tire3a. The roller drum 3 may be from about 30 percent to 50 percent heavierthan the drum 2. However, the weight of drum 3 may be made more than 50percent heavier than that of drum 2. In this latter instance, theheavier drum 3 advantageously amounts to at least 50 percent of theoverall weight of the road roller 1. The heavy drum 3 has a vibrationshaft 15 on which eccentric weights 16 are mounted. The shaft 15 isrotatably mounted in bearings 17 in the axle parts 9. A pulley wheel 18is mounted on an end 15a of the shaft 15.

A motor 19 is mounted on the frame 4, 5 and 6 above the drum 2. Themotor 19 can simultaneously drive the road roller 1 and the vibrationshaft 15. The motor 19 is connected by a belt drive 20 to a gearbox 21mounted in the middle of the road roller 1. The power from the motor 19is'divided in the gearbox 21 between the road-drive gear means ll, -l2,l3 and 14 and the vibration shaft 15. A smaller part of the power goesto the road-drive gear means l1, 12, 13 and 14. A reversing gear (notshown) within the gearbox 21 is provided for'the reverse travel of theroad roller 1. The larger portion of the power goes to the vibrationshaft 15 by way of the pulley wheel 22. A toothed belt 23 connects thepulley wheel 22 to the belt pulley 18 for driving the vibration shaft15. A pulley wheel 24 is inserted to apply tension to the toothed belt23. The gear drive means 1,1, 12, 13 and 14 is located in a housing 25.The gear drive means l1, l2, l3 and 14 is located in a housing 25. Thedrive means 18, 22, 23 and 24 are located in the housing 26. The roadroller 1 can be equipped with an insertable drawbar 27 for steering theroad roller. The weight and size of the eccentric weights 16 arearranged to suit the tire 3a of the drum 3 in a manner known in thepriorart. A gear shift lever. 28 allows selection of neutral, reverse orforward gears. A motor may be provided to independently drive the roadroller 1 and the vibration shaft 15.

The road roller 1 is made sufficiently narrow to form aground-compressing implement for consolidation work in a ditch. Themotor 19 and gearbox 21 are therefore advantageously mounted one behindthe other in the direction of travel since the motor 19 is capable ofbeing mounted above the rear drum 2. As shown in FIGS. 1, 2 and 3, onlythe front drum 3 which has the heavier weight and therefore heavyinertia forces is equipped with a vibration shaft 15. The rear drum 2 islighter and used to support the roller 1. The lighter drum 2 does nothave a vibration shaft in this embodiment.

The lighter rear drum 2 is provided with a vibration shaft 29 carryingeccentric weights 30 as shown in the embodiment of FIG. 4. The weights30 are correspondingly lighter than the weights 16 which are mounted onthe shaft 15. That is, both drums 2 and 3 are provided with eccentricweights. The vibration shaft 29 has-a laterally projecting pulley wheel31 driven by a toothedbelt 32 from a pulley wheel 33. The pulley wheel33 is independent of a pulley wheel (not shown) which drives thevibration shaft through toothed belt 23. A clutch may be provided forthe pulley wheels which control the movement of the pulley belts 32 and23. In this way either the shaft 29 or the shaft 15, respectively, maybe selectively driven by the motor 34. A road roller having theconstruction as shown in FIG. 4 enables the use of two possible types ofvibration. The drum 3 having the heavier vibrator strokes may take upthe full power of the motor 34 for the vibratory drive. If a lesservibratory power is needed, only the rear vibratory shaft 29 is driven.The rear vibratory shaft 29 can theoretically deliver about one-half theinertia force of the vibratory shaft 15. This distribution of thedelivery of inertia force is made in accordance with the weight ratiosused in the eccentric weights and 16 and total weights of the drums 2and 3.

The motor 34 can be mounted side by side with the gear box when the roadroller of this embodiment has a sufficient width. The gearbox 35 has abranch for the road drive with a corresponding clutch for neutral,forward and reverse gears. A ganged road roller shown in FIGS. 5 and 6consists of units generally designated 1a and lb including roller drums2a, 3a and 2b, 3b, respectively. The drums 3a, 3b are longer than thedrums 2a, 2b. In addition, the drums 3a, 3b have thicker and heaviertires than the drums 2a, 2b. The outer ends of the drums 2a, 3a and 2b,3b are in alignment with the frame side 4a on the drive side. Thedifference in length of the drums as shown necessitates the use of astepped frame 5a. The stepped frame 5a follows the configuration of theoffset drums 2a, 3a and 2b, 3b. The transverse crosspieces 36 connectthe roller sides and 5a. The heavy drums 3a and 3b are mounteddiagonally to one another in the ganged structure including units la and1b as. are the drums 2a and 2b. The roller drums 2a, 3a, and 2b, 3b areoffset to avoid leaving any uncompressed middle strip on the ground. Thecoupling of the units laand lbis effected by the use of elastic couplingunits 37. In this example, the coupling units 37 are buffers composed ofrubber. The coupling members 37 are mounted outside the area of movementof the roller drums 2a, 3a and 2b, 3b. in this way, the units la and lbmay be fixedly attached in a very close relationship. The coupling ofeach of the units In and lb with a motor and gearbox comes within thescope of this invention. Likewise, another embodiment may alternatelyprovide for the units to be used together forming a road roller withonly one motor and gearbox.

The specific weight of the relatively heavy tire 3a can be 1 from 500kg. to 1,200 kg. depending on the desired size. The

roller will be about 1 to lOO.

While the road roller has been shown and described in detail, it isobvious that this invention is not to be considered as being limited tothe exact form disclosed, and that changes in detail and constructionmay be made therein within the scopeof what is claimed, withoutdeparting from the spirit of this invention.

Having thus set forth and disclosed the nature of this invention, what Iclaim is:

l. A vibratory road roller comprising:

a. axle shafts mounted in a rigid frame structure;

b. said shafts being laterally displaced one behind the other in thedirection of travel;

0. two roller drums mounted on said shafts;

d. one of said drums being considerably heavier than the other drums;

e. vibration-producing means including eccentric weights mounted on eachof the shafts carrying the roller drums; the eccentric weights on theshaft carrying the heavier roller being heavier than the eccentricweights on the shaft carrying the lighter roller drums; and

. A vibratory road roller comprising: axle shafts mounted in a rigidframe structure;

in the direction of travel;

roller drums having substantially equal diameters mounted on saidshafts;

d. one of said roller drums being considerably heavier than another ofsaid drums;

e. vibration-producing means attached to at least the shaft of theheavier of said roller drums; and

f. motor means to supply power to each of the roller drums.

3. A vibratory road roller as defined in claim 2 wherein:

said vibration-producing means include eccentric weights mounted on atleast one of the shafts.

4. A vibratory road roller as defined in claim 3 wherein:

there are two roller drums; and

said eccentric weights are mounted on the shaft carrying the heavierroller drum. Y

5. A vibratory road roller as defined in claim 3 wherein:

there are two roller drums; and I said heavier roller drum is longerthan said lighter roller drum.

6. A vibratory road roller as defined in claim 2 wherein:

there are two roller drums; and

said heavier roller drum is about 30 percent to 50 percent heavier thanthe lighter roller drum.

7. A vibratory road roller as defined in claim 2 wherein:

there are two roller drums; and

said heavier roller drum is over 50 percent heavier than the lighterroller drum.

8. A vibratory road roller as defined in claim 2 wherein:

there are two roller drums; and

said heavier roller drum has a weight of at least 50 percent of theoverall weight of the road roller.

9. A vibratory road roller comprising:

a. means mounting two axle shafts laterally displaced one behind theother in the direction of travel in a frame structure;

b. a roller drum having a tire mounted on each shaft;

c. one of said roller drum tires being considerably heavier than theother roller drum tire;

vibration-producing means attached to at least the shaft of the heavierroller drums;

e. said vibration-producing means including at least one eccentricweight mounted on each of the axle shafts;

f. the eccentric weight on the shaft carrying the heavier roller drumtire being heavier than the eccentric weight on the shaft carrying thelighter roller drum tire; and

g. the ratio of the weight of the heavier eccentric weight to the weightof the lighter eccentric weight corresponds to the ratio of the heavierroller drum tire weight to the lighter roller drum tire weight.

. motor means to supply power to each of the roller drums.

. said shafts being laterally displaced one behind the other 10. Avibratory road roller as defined in claim 9 further including: I

a clutch means to connect said motor means to drive either of the shaftscarrying the eccentric weights.

1]. A vibratory road roller as defined in claim 9 wherein:

said motor means is located above the lighter roller drum.

12. A vibratory road roller as defined in claim 9 further including:

a gearbox means for housing gear means which connect the motor means tosaid roller drums; and said motor means and said gearbox means beinglocated adjacent to each other in the middle of the road roller. 13. Avibratory road roller comprising: a. means mounting two axle shaftslaterally displaced one behind the other in the direction of travel in aframe.

structure;

b. roller drums being mounted on said shafts;

0. one of said roller drums being considerably heavier than anotherroller drum;

d. the heavier drum being longer than the lighter drum;

c. said drums having end faces which are aligned on the drive side ofthe road roller;

f. said frame structure having a stepped configuration on the other sideto follow the offset ends of the longer and shorter drums; v

g. vibration-producing means attached to at least the shaft of theheavier roller drum; and

h. motor means to supply power to each of the roller drums.

14. A vibratory road roller comprising: a. a frame structure includingtwo frame units having two roller drums mounted on axle shafts laterallydisplaced one behind the other in the direction of travel within eachframe unit and means connecting said frame units;

b. one of said rollers on said laterally displaced shafts beingconsiderably heavier than the other roller drum in each said frame unit;4

c. said heavier roller drum being longer than said lighter roller drumwithin each said frame unit;

d. said roller drums having end faces which are aligned on the driveside of the road roller;

e. each said frame unit having a stepped configuration on the other sideto follow the offset sides of the longer and shorter roller drums withineach unit;

f. vibration-producing means attached to at least one of the shafts;and

g. motor means to supply power to one roller drum.

15. A vibratory road roller as defined in claim 14 wherein:

said longer roller drums are diagonally disposed within said road rollerframe structure; and

said shorter roller drums are diagonally disposed within said roadroller frame structure.

l6. A vibratory road roller asidefined in claim 14 wherein:

said frame unit connecting means include elastic coupling members spacedrespectively to the front and rear of the front and rear roller drums.

1. A vibratory road roller comprising: a. axle shafts mounted in a rigidframe structure; b. said shafts being laterally displaced one behind theother in the direction of travel; c. two roller drums mounted on saidshafts; d. one of said drums being considerably heavier than the otherdrums; e. vibration-producing means including eccentric weights mountedon each of the shafts carrying the roller drums; f. the eccentricweights on the shaft carrying the heavier roller being heavier than theeccentric weights on the shaft carrying the lighter roller drums; and g.motor means to supply power to each of the roller drums.
 2. A vibratoryroad roller comprising: a. axle shafts mounted in a rigid framestructure; b. said shafts being laterally displaced one behind the otherin the direction of travel; c. roller drums having substantially equaldiameters mounted on said shafts; d. one of said roller drums beingconsiderably heavier than another of said drums; e. vibration-producingmeans attached to at least the shaft of the heavier of said rollerdrums; and f. motor means to supply power to each of the roller drums.3. A vibratory road roller as defined in claim 2 wherein: saidvibration-producing means include eccentric weights mounted on at leastone of the shafts.
 4. A vibratory road roller as defined in claim 3wherein: there are two roller drums; and said eccentric weights aremounted on the shaft carrying the heavier roller drum.
 5. A vibratoryroad roller as defined in claim 3 wherein: there are two roller drums;and said heavier roller drum is longer than said lighter roller drum. 6.A vibratory road roller as defined in claim 2 wherein: there are tworoller drums; and said heavier roller drum is about 30 percent to 50percent heavier than the lighter roller drum.
 7. A vibratory road rolleras defined in claim 2 wherein: there are two roller drums; and saidheavier roller drum is over 50 percent heavier than the lighter rollerdrum.
 8. A vibratory road roller as defined in claim 2 wherein: thereare two roller drums; and said heavier roller drum has a weight of atleast 50 percent of the overall weight of the road roller.
 9. Avibratory road roller comprising: a. means mounting two axle shaftslaterally displaced one behind the other in the direction of travel in aframe structure; b. a roller drum having a tire mounted on each shaft;c. one of said roller drum tires being considerably heavier than theother roller drum tire; d. vibration-producing means attached to atleast the shaft of the heavier roller drums; e. said vibration-producingmeans including at least one eccentric weight mounted on each of theaxle shafts; f. the eccentric weight on the shaft carrying the heavierroller drum tire being heavier than the eccentric weight on the shaftcarrying the lighter roller drum tire; and g. the ratio of the weight ofthe heavier eccentric weight to the weight of the lighter eccentricweight corresponds to the ratio of the heavier roller drum tire weightto the lighter roller drum tire weight.
 10. A vibratory road roller asdefined in claim 9 further including: a clutch means to connect saidmotor means to drive either of the shafts carrying the eccentricweights.
 11. A vibratory road roller as defined in claim 9 wherein: saidmotor means is located above the lighter roller drum.
 12. A vibratoryroad roller as defined in claim 9 further including: a gearbox means forhousing gear means which connect the motor means to said roller drums;and said motor means and said gearbox means being located adjacent toeach other in the middle of the road roller.
 13. A vibratory road rollercomprising: a. means mounting two axle shafts laterally displaced onebehind the other in the direction of travel in a frame structure; b.roller drums being mounted on said shafts; c. one of said roller drumsbeing considerably heavier than another roller drum; d. the heavier drumbeing longer than the lighter drum; e. said drums having end faces whichare aligned on the drive side of the road roller; f. said framestructure having a stepped configuration on the other side to follow theoffset ends of the longer and shorter drums; g. vibration-producingmeans attached to at least the shaft of the heavier roller drum; and h.motor means to supply power to each of the roller drums.
 14. A vibratoryroad roller comprising: a. a frame structure including two frame unitshaving two roller drums mounted on axle shafts laterally displaced onebehind the other in the direction of travel within each frame unit andmeans connecting said frame units; b. one of said rollers on saidlaterally displaced shafts being considerably heavier than the otherroller drum in each said frame unit; c. said heavier roller drum beinglonger than said lighter roller drum within each said frame unit; d.said roller drums having end faces which are aligned on the drive sideof the road roller; e. each said frame unit having a steppedconfiguration on the other side to follow the offset sides of the longerand shorter roller drums within each unit; f. vibration-producing meansattached to at least one of the shafts; and g. motor means to supplypower to one roller drum.
 15. A vibratory road roller as defined inclaim 14 wherein: said longer roller drums are diagonally disposedwithin said road roller frame structure; and said shorter roller drumsare diagonally disposed within said road roller frame structure.
 16. Avibratory road roller as defined In claim 14 wherein: said frame unitconnecting means include elastic coupling members spaced respectively tothe front and rear of the front and rear roller drums.